It's Polish iron curtain era lathe so they were probably not that familiar what is commonly used in imperialistic countries.
Not likely at all. Poland has has "family connections" since (at least) our Revolutionary War. immigrant Poles were major contributors to our technical industries far more than farming or dairy. Eg: mining, steelmaking, automaking, railway, shipbuilding, aircraft, metalworking in general, and many kept in touch with family.
Many blue-collar workers and Widows with US citizenship retired back to Poland even during Soviet domination times because even a very modest pension or Social Security income in hard-currency US$ let them live rather well in that economy.
Nah. Poles would be "more aware than average" of US measure and in "industrial" use.
Looks like a simple "fiddle" of a cost-cutting shortcut, to me..
Much the same as USSR Arsenals not wasting resources to convert millions of battle rifle sights from Tzarist Arshins to meters, nor the USA wasting money converting legacy infantry weapons, anti-tank and heavy Naval gunnery included - from yards to meters when THEY switched-over.
"Run what yah got" applied. Then and now.
We have "puters" now. Put a DTI to it, confirm what is ACTUALLY going-on, "do the math", generate a new chart, laminate it or even "metalphoto" it, and go make chips.